CN111849187A - Water-resistant formaldehyde-free high-density fiberboard and preparation process thereof - Google Patents
Water-resistant formaldehyde-free high-density fiberboard and preparation process thereof Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L97/00—Compositions of lignin-containing materials
- C08L97/02—Lignocellulosic material, e.g. wood, straw or bagasse
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27N—MANUFACTURE BY DRY PROCESSES OF ARTICLES, WITH OR WITHOUT ORGANIC BINDING AGENTS, MADE FROM PARTICLES OR FIBRES CONSISTING OF WOOD OR OTHER LIGNOCELLULOSIC OR LIKE ORGANIC MATERIAL
- B27N3/00—Manufacture of substantially flat articles, e.g. boards, from particles or fibres
- B27N3/04—Manufacture of substantially flat articles, e.g. boards, from particles or fibres from fibres
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27N—MANUFACTURE BY DRY PROCESSES OF ARTICLES, WITH OR WITHOUT ORGANIC BINDING AGENTS, MADE FROM PARTICLES OR FIBRES CONSISTING OF WOOD OR OTHER LIGNOCELLULOSIC OR LIKE ORGANIC MATERIAL
- B27N3/00—Manufacture of substantially flat articles, e.g. boards, from particles or fibres
- B27N3/08—Moulding or pressing
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08H—DERIVATIVES OF NATURAL MACROMOLECULAR COMPOUNDS
- C08H6/00—Macromolecular compounds derived from lignin, e.g. tannins, humic acids
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/30—Sulfur-, selenium- or tellurium-containing compounds
- C08K2003/3045—Sulfates
- C08K2003/3063—Magnesium sulfate
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
- C08L2205/035—Polymer mixtures characterised by other features containing three or more polymers in a blend containing four or more polymers in a blend
Abstract
The invention relates to the technical field of fiberboard processing, and particularly discloses a water-resistant formaldehyde-free high-density fiberboard which comprises the following raw materials in parts by weight: 50-100 parts of wood fiber, 1-20 parts of adhesive, 1-20 parts of activated lignin, 1-10 parts of auxiliary agent, 1-10 parts of waterproof agent, 1-5 parts of reducing agent and 1-5 parts of inorganic cementing material; the activated lignin is prepared by the following method: adding lignin into absolute ethyl alcohol to prepare an ethanol solution of the lignin, carrying out ultrasonic treatment, and obtaining micromolecular lignin after filtering and ethanol evaporation and recovery; mixing micromolecular lignin with water, adjusting the pH value to be 4-6, adding a mediator which accounts for 0.02-1.0% of the weight of the lignin, heating to 35-55 ℃, adding enzyme for reacting for 60-120 min to obtain an enzyme-treated lignin solution, and then adding sodium borohydride, potassium borohydride or oxalic acid for reacting to obtain activated lignin. The water-resistant formaldehyde-free high-density fiberboard does not release formaldehyde, has high density, high bonding strength, good water resistance and good machining performance, and is favorable for popularization and application of the fiberboard.
Description
Technical Field
The invention belongs to the technical field of fiberboard processing, and particularly relates to a water-resistant formaldehyde-free high-density fiberboard and a preparation process thereof.
Background
The fiber board is a material widely applied in the fields of building, decoration, furniture and the like, for example, the base material used for the reinforced floor is mainly a medium-high density fiber board, and the fiber board is a board which is prepared by using wood fibers or other plant fibers as raw materials, preparing the fibers, applying synthetic resin, and pressing under the conditions of heating and pressurizing. The synthetic resin mainly adopts a urea-formaldehyde resin adhesive and a phenolic resin adhesive which are made of petroleum as raw materials, and the two adhesives can volatilize some harmful substances such as formaldehyde, phenol and the like in the using process, so that the health of a human body is harmed and the air environment is polluted. With the improvement of social development level and the enhancement of environmental protection consciousness of people, the requirements on the fiber board are higher and higher, and especially the requirements on the release amount of harmful substances are stricter and stricter. At present, isocyanate is mainly used as an adhesive, and isocyanate is simply used as the adhesive to prepare a fiberboard, so that the problems of low bonding strength, high brittleness, poor water resistance, low density, poor routing performance and the like in a finished fiberboard exist, the fiberboard is easy to absorb moisture when placed in the air, and the fiberboard deforms seriously after absorbing moisture, so that the application of the formaldehyde-free fiberboard is greatly limited.
Lignin is a complex natural high polymer commonly existing in plants, and forms a main component of a plant skeleton together with cellulose and hemicellulose, and has renewability. The lignin is a byproduct in the paper industry, the biological energy industry and the like, and has rich sources, low price and easy obtainment. Lignin is a cross-linked phenol polymer, active groups such as aromatic groups, phenolic hydroxyl groups, alcoholic hydroxyl groups, carbon-based conjugated double bonds and the like exist in a molecular structure, and the lignin has great application potential in adhesives due to the molecular characteristics of the lignin. However, natural lignin is a biological macromolecule, only a very small amount of active groups such as phenolic hydroxyl groups, alcoholic hydroxyl groups and the like are exposed, the activity is extremely low, and the natural lignin is difficult to participate in reactions such as gluing and curing, so that the application of the natural lignin in the fields of adhesives and artificial boards is limited. The invention provides a method for preparing a water-resistant aldehyde-free high-density fiberboard by using induction activated lignin as a main gelling component, wherein the activated lignin is used as the main gelling component to be matched with adhesives such as pMDI (pMDI) and the like for use, so that the high-density water-resistant aldehyde-free fiberboard is pressed, and the problems of high brittleness, poor water resistance, low density and the like of the conventional aldehyde-free fiberboard are solved.
Disclosure of Invention
The invention aims to provide a water-resistant formaldehyde-free high-density fiberboard, so that the defects of low internal bonding strength, high brittleness, poor water resistance, low density and the like of the conventional fiberboard are overcome.
In order to achieve the purpose, the invention provides a water-resistant formaldehyde-free high-density fiberboard which comprises the following raw materials in parts by weight: 50-100 parts of wood fiber, 1-20 parts of adhesive, 1-20 parts of activated lignin, 1-10 parts of auxiliary agent, 1-10 parts of waterproof agent, 1-5 parts of reducing agent and 1-5 parts of inorganic cementing material;
the preparation method of the activated lignin comprises the following steps:
adding 1-10 parts by weight of lignin into 1-10 parts by weight of absolute ethyl alcohol to prepare an absolute ethyl alcohol solution of the lignin, carrying out ultrasonic treatment on the absolute ethyl alcohol solution of the lignin for 20-60 min at normal temperature by using an ultrasonic generator with the frequency of 40-80 kHz, filtering the treated solution, taking clear liquid, and carrying out rotation or vacuum filtration to evaporate the alcohol to obtain micromolecular lignin;
secondly, mixing 1-10 parts of the micromolecule lignin obtained in the first step with 1-10 parts of water, adding a pH regulator to regulate the pH value to 4-6, then adding a mediator accounting for 0.02-1.0% of the weight of the lignin, heating to 35-55 ℃, adding an enzyme, reacting for 60-120 min, and standing at room temperature for 2-6 h to obtain an enzyme-treated lignin solution; further depolymerizing the molecular structure of lignin by enzyme treatment;
Thirdly, adding sodium borohydride, potassium borohydride or oxalic acid which accounts for 1.0-6.0% of the mass of the lignin into the lignin solution subjected to enzyme treatment, and reacting at room temperature for 18-24 hours to obtain an activated lignin solution, namely the activated lignin. Sodium borohydride, potassium borohydride or oxalic acid is added to reduce the lignin treated by the enzyme, so that the contents of alcoholic hydroxyl and phenolic hydroxyl of lignin molecules are improved to the maximum extent, and the activity of the lignin is further improved.
Preferably, in the waterproof aldehyde-free high-density fiberboard, the wood fiber is one or more of eucalyptus, poplar, pine and hardwood and is obtained by chipping, screening, cooking and softening, hot grinding and drying, and the water content of the wood fiber is 5-15%.
Preferably, in the waterproof aldehyde-free high-density fiberboard, the adhesive is one or more of isocyanate, soybean gum and cottonseed meal gum.
Preferably, in the waterproof aldehyde-free high-density fiberboard, the auxiliary agent is one or more of polyvinyl alcohol, polyether polyol, isopropanol, formamide and carbamide. Alcohol and amine functional groups in the auxiliary agent can react with isocyanate to generate a crosslinking effect, so that the stability of the isocyanate in the reaction process can be improved, the reaction process of the isocyanate adhesive is delayed, and the problems of poor fiber bonding effect, reduced mechanical property of the board and the like caused by quick curing of the isocyanate are avoided.
Preferably, in the water-resistant formaldehyde-free high-density fiberboard, the water-proofing agent is paraffin, organosiloxane or aluminate.
Preferably, in the waterproof aldehyde-free high-density fiberboard, the reducing agent is one or more of sodium borohydride, potassium borohydride and oxalic acid.
Preferably, in the water-resistant aldehyde-free high-density fiberboard, the inorganic gelling material is aluminum dihydrogen phosphate, sodium silicate, magnesium sulfate, magnesium chloride or calcium oxide. The inorganic cementing material can improve the heat resistance of the fiber plate blank in the forming process, increase the bonding strength of the fiber plate blank, improve the initial viscosity of the fiber plate blank, reduce the pre-pressing rebound rate of the plate blank and improve the forming density of the plate.
Preferably, in the above water-resistant aldehyde-free high-density fiberboard, the medium comprises: one or more of vanillone, acetosyringone, syringaldehyde, p-coumaric acid, ferulic acid, methyl syringate, sinapic acid, vanillin, ABTS and HBT; the enzyme is one or more of laccase, peroxidase, oxidase and xylanase. Different enzymes have different activation or degradation conditions on different positions of lignin, and rapid and efficient targeted activation can be performed by using combined treatment of different enzyme types.
Preferably, in the water-resistant formaldehyde-free high-density fiberboard, the pH regulator is one or more of citric acid, sulfuric acid, hydrochloric acid, formic acid, acetic acid and sodium acetate.
A preparation method of the waterproof aldehyde-free high-density fiberboard comprises the following steps:
(1) uniformly mixing the raw materials, paving and forming to obtain a plate blank;
(2) hot-pressing the plate blank obtained in the step (1), wherein the hot-pressing technological parameters are as follows: and (3) hot-pressing at the temperature of 160-240 ℃, for 3-5 min, and under the pressure of 1-7 MPa, so as to obtain the fiberboard.
Compared with the prior art, the invention has the following beneficial effects:
1. the waterproof formaldehyde-free high-density fiberboard disclosed by the invention does not release formaldehyde, has the advantages of environmental friendliness, high density, good water resistance and good machining performance, has better effects such as routing and slotting, improves the mechanical properties such as internal bonding strength, static bending strength and elastic modulus, and is beneficial to popularization and application of the fiberboard.
2. The invention adopts mechanochemical combination to process lignin, reduces the molecular weight of the lignin and enhances the activity of the lignin by depolymerizing and reconstructing the lignin structure and reducing the active groups, so that the lignin has strong affinity. The activated lignin replaces part of adhesives such as isocyanate, soybean gum or cottonseed meal glue and the like, and can react with glycosyl chemical bonds in wood fibers, hydrogen bonds in isocyanate, soybean gum or cottonseed meal glue and the like, so that the bonding strength of the wood fibers is improved, and the thickness of a glue layer is reduced. Meanwhile, the enzyme and the mediator in the activated lignin can promote the activation of the lignin in the wood fiber, improve the gluing reaction effect, enable the wood fiber in the fiberboard to be combined more uniformly and tightly, and finally improve various physical mechanical properties, water resistance and machining performance of the board.
3. According to the invention, the alcohol or amide compound auxiliary agent is added, so that the stability of isocyanate in the reaction process is improved, the reaction process of the isocyanate adhesive is delayed, and the problems of poor fiber bonding effect, reduced mechanical property of the board and the like caused by rapid curing of the isocyanate are avoided. The inorganic cementing material is added, so that the heat resistance of the fiber plate blank in the forming process can be improved, the bonding strength of the fiber plate blank is improved, the initial viscosity of the fiber plate blank is improved, the pre-pressing resilience rate of the plate blank is reduced, and the forming density of the plate is improved.
Detailed Description
The following detailed description of specific embodiments of the invention is provided, but it should be understood that the scope of the invention is not limited to the specific embodiments.
Example 1
A water-resistant formaldehyde-free high-density fiberboard comprises the following raw materials in parts by weight: 80 parts of wood fiber, 15 parts of isocyanate, 15 parts of activated lignin, 6 parts of polyvinyl alcohol, 8 parts of organic siloxane, 3 parts of sodium borohydride and 3 parts of aluminum dihydrogen phosphate; the wood fiber is prepared from eucalyptus through chipping, screening, stewing for softening, hot grinding and drying, and the water content of the wood fiber is 10%;
the preparation method of the activated lignin comprises the following steps:
adding 10 parts by weight of lignin into 10 parts by weight of absolute ethyl alcohol to prepare an absolute ethyl alcohol solution of the lignin, carrying out ultrasonic treatment on the absolute ethyl alcohol solution of the lignin for 30min at normal temperature by using an ultrasonic generator with the frequency of 60kHz, filtering the treated solution, taking clear liquid, and carrying out rotary evaporation on the clear liquid to remove the ethanol to obtain micromolecular lignin;
Mixing 10 parts of micromolecular lignin obtained in the step I with 8 parts of deionized water, adding citric acid to adjust the pH value to 5, then adding 0.08% of vanillone based on the weight of the lignin, heating to 50 ℃, adding laccase, reacting for 60min, and standing for 3h at room temperature to obtain an enzyme-treated lignin solution, wherein the addition amount of the enzyme is 0.4 u/g;
thirdly, adding sodium borohydride accounting for 1.0 percent of the mass of the lignin into the lignin solution after enzyme treatment, and reacting for 24 hours at room temperature to obtain activated lignin solution.
The embodiment also provides a preparation method of the water-resistant aldehyde-free high-density fiberboard, which specifically comprises the following steps:
(1) uniformly mixing the raw materials, paving and forming to obtain a plate blank;
(2) and (2) hot-pressing the plate blank obtained in the step (1), wherein the hot-pressing temperature is 180 ℃, the hot-pressing time is 5min, and the hot-pressing pressure is 5MPa, so that the fiber plate is prepared.
Example 2
This example differs from example 1 in that vanillin was used instead of acetophenone, and the other steps and parameters were the same as in example 1.
Example 3
This example differs from example 1 in that p-coumaric acid was used in place of the acetophenone, and the other steps and parameters were the same as in example 1.
Example 4
This example differs from example 1 in that methyl syringate was used in place of the acetophenon and the other steps and parameters were the same as in example 1.
Example 5
This example differs from example 1 in that instead of acetophenone, ABTS was used, the other steps and parameters were the same as in example 1.
Example 6
This example differs from example 1 in that instead of acetophenone, ABTS and HBT were used in a weight ratio of 1:1, and the other steps and parameters were the same as in example 1.
Example 7
This example differs from example 1 in that the peroxidase was used instead of laccase, and the other steps and parameters were the same as in example 1.
Example 8
The difference between this example and example 1 is that laccase and xylanase are mixed instead of laccase, the ratio of laccase to xylanase is 2:1, and other steps and parameters are the same as example 1.
Example 9
A water-resistant formaldehyde-free high-density fiberboard comprises the following raw materials in parts by weight: 80 parts of wood fiber, 12 parts of isocyanate, 18 parts of activated lignin, 7 parts of polyether polyol, 8 parts of aluminate, 2 parts of potassium borohydride and 3 parts of sodium silicate; the wood fiber is prepared from eucalyptus through chipping, screening, stewing for softening, hot grinding and drying, and the water content of the wood fiber is 10%;
the preparation method of the activated lignin comprises the following steps:
adding 10 parts by weight of lignin into 10 parts by weight of absolute ethyl alcohol to prepare an absolute ethyl alcohol solution of the lignin, carrying out ultrasonic treatment on the absolute ethyl alcohol solution of the lignin for 60min at normal temperature by using an ultrasonic generator with the frequency of 40kHz, filtering the treated solution, taking clear liquid, carrying out vacuum filtration, and evaporating the ethanol to obtain micromolecular lignin;
Secondly, mixing 10 parts of the micromolecular lignin obtained in the first step with 8 parts of deionized water, adding acetic acid to adjust the pH to 4.5, then adding 0.06% ABTS of the weight of the lignin, heating to 40 ℃, adding laccase, reacting for 80min, and standing for 5h at room temperature to obtain an enzyme-treated lignin solution, wherein the addition amount of the enzyme is 0.3 u/g;
thirdly, adding potassium borohydride accounting for 1.0 percent of the mass of the lignin into the lignin solution after enzyme treatment, and reacting for 24 hours to obtain activated lignin solution.
The embodiment also provides a preparation method of the water-resistant aldehyde-free high-density fiberboard, which specifically comprises the following steps:
(1) uniformly mixing the raw materials, paving and forming to obtain a plate blank;
(2) and (2) carrying out hot pressing on the plate blank obtained in the step (1) at the temperature of 220 ℃, for 3min and under the pressure of 6MPa to obtain the fiberboard.
Example 10
A water-resistant formaldehyde-free high-density fiberboard comprises the following raw materials in parts by weight: 100 parts of wood fiber, 8 parts of isocyanate, 8 parts of soybean gum, 20 parts of activated lignin, 4 parts of polyvinyl alcohol, 2 parts of formamide, 8 parts of paraffin, 5 parts of potassium borohydride and 5 parts of magnesium sulfate; the wood fiber is prepared from eucalyptus and poplar through chipping, screening, stewing for softening, hot grinding and drying, and the water content of the wood fiber is 10%;
The preparation method of the activated lignin comprises the following steps:
adding 10 parts by weight of lignin into 10 parts by weight of absolute ethyl alcohol to prepare an absolute ethyl alcohol solution of the lignin, carrying out ultrasonic treatment on the absolute ethyl alcohol solution of the lignin for 60min at normal temperature by using an ultrasonic generator with the frequency of 40kHz, filtering the treated solution, taking clear liquid, carrying out vacuum filtration, and evaporating the ethanol to obtain micromolecular lignin;
mixing 10 parts of micromolecular lignin obtained in the step I with 8 parts of deionized water, adding sulfuric acid to adjust the pH value to 5, then adding 0.06% of mediator based on the weight of the lignin, wherein the mediator is ABTS and HBT, the proportion of ABTS to HBT is 1:1, heating to 55 ℃, adding xylanase, reacting for 60min, standing for 4h at room temperature to obtain an enzyme-treated lignin solution, wherein the addition amount of the enzyme is 0.5u/g according to the mass of the lignin;
thirdly, adding potassium borohydride accounting for 1.5 percent of the mass of the lignin into the lignin solution after enzyme treatment, and reacting for 20 hours to obtain activated lignin solution.
The embodiment also provides a preparation method of the water-resistant aldehyde-free high-density fiberboard, which specifically comprises the following steps:
(1) uniformly mixing the raw materials, paving and forming to obtain a plate blank;
(2) And (2) hot-pressing the plate blank obtained in the step (1), wherein the hot-pressing temperature is 240 ℃, the hot-pressing time is 3min, and the hot-pressing pressure is 6MPa, so that the fiber plate is prepared.
Example 11
A water-resistant formaldehyde-free high-density fiberboard comprises the following raw materials in parts by weight: 60 parts of wood fiber, 5 parts of soybean gum, 10 parts of activated lignin, 3 parts of carbamide, 4 parts of organic siloxane, 2 parts of oxalic acid and 1.5 parts of aluminum dihydrogen phosphate; the wood fiber is prepared from eucalyptus and poplar through chipping, screening, stewing for softening, hot grinding and drying, and the water content of the wood fiber is 8%;
the preparation method of the activated lignin comprises the following steps:
adding 5 parts by weight of lignin into 4 parts by weight of absolute ethyl alcohol to prepare an absolute ethyl alcohol solution of the lignin, carrying out ultrasonic treatment on the absolute ethyl alcohol solution of the lignin for 20min at normal temperature by using an ultrasonic generator with the frequency of 80kHz, filtering the treated solution, taking clear liquid, carrying out vacuum filtration, and evaporating the ethanol to obtain micromolecular lignin;
secondly, mixing 5 parts of micromolecular lignin obtained in the first step with 5 parts of deionized water, adding acetic acid to adjust the pH value to 6, then adding 0.05 percent of HBT (heterojunction bipolar transistor) based on the weight of the lignin, heating to 40 ℃, adding laccase and oxidase, wherein the addition ratio of the laccase to the oxidase is 2:1, the addition amount of the enzyme is 0.3u/g according to the mass of the lignin, reacting for 120min, and standing for 3h at room temperature to obtain an enzyme-treated lignin solution;
And thirdly, adding oxalic acid with the mass of 2.0 percent of that of the lignin into the lignin solution after enzyme treatment, and reacting for 24 hours to obtain activated lignin solution.
The embodiment also provides a preparation method of the water-resistant aldehyde-free high-density fiberboard, which specifically comprises the following steps:
(1) uniformly mixing the raw materials, paving and forming to obtain a plate blank;
(2) and (2) hot-pressing the plate blank obtained in the step (1), wherein the hot-pressing temperature is 180 ℃, the hot-pressing time is 5min, and the hot-pressing pressure is 4MPa, so that the fiber plate is prepared.
Comparative example 1
A water-resistant formaldehyde-free high-density fiberboard comprises the following raw materials in parts by weight: 80 parts of wood fiber, 30 parts of isocyanate, 6 parts of polyvinyl alcohol, 8 parts of a waterproof agent, 3 parts of a reducing agent and 3 parts of aluminum dihydrogen phosphate; the wood fiber is prepared from eucalyptus wood by slicing, screening, steaming and softening, hot grinding and drying, and has a water content of 10%.
The water-resistant aldehyde-free high-density fiberboard of this comparative example was prepared in the same manner as in example 1.
The performance of the fiberboards with the thickness of 18mm prepared in the examples 1-11 and the comparative example 1 is tested according to the method in the GB/T17657-2013 standard, wherein the formaldehyde emission adopts 1m3The test results are shown in table 1, the formaldehyde emission of the fiberboard reaches formaldehyde-free level (less than 0.03 mg/m) 3)。
TABLE 1 Fibreboard Performance data for inventive and comparative examples
As can be seen from Table 1, the performance of the fiberboard in the embodiment of the invention is obviously superior to that of the fiberboard in the comparative example, the performance index meets the performance requirement of a high-wet high-density fiberboard in GB/T31765 2015 standard, which shows that the problems of poor water resistance, low bonding strength and the like of the conventional fiberboard are overcome by using activated lignin and adhesives such as pMDI and the like in a matching way.
The foregoing descriptions of specific exemplary embodiments of the present invention have been presented for purposes of illustration and description. It is not intended to limit the invention to the precise form disclosed, and obviously many modifications and variations are possible in light of the above teaching. The exemplary embodiments were chosen and described in order to explain certain principles of the invention and its practical application to enable one skilled in the art to make and use various exemplary embodiments of the invention and various alternatives and modifications as are suited to the particular use contemplated. It is intended that the scope of the invention be defined by the claims and their equivalents.
Claims (10)
1. The water-resistant formaldehyde-free high-density fiberboard is characterized by comprising the following raw materials in parts by weight: 50-100 parts of wood fiber, 1-20 parts of adhesive, 1-20 parts of activated lignin, 1-10 parts of auxiliary agent, 1-10 parts of waterproof agent, 1-5 parts of reducing agent and 1-5 parts of inorganic cementing material;
the preparation method of the activated lignin comprises the following steps:
2. The water-resistant formaldehyde-free high-density fiberboard of claim 1, wherein the wood fiber is one or more of eucalyptus, poplar, pine and hardwood, and is obtained by chipping, screening, steaming and softening, hot grinding and drying, and the water content of the wood fiber is 5-15%.
3. The water-resistant aldehyde-free high-density fiberboard of claim 1, wherein the adhesive is one or more of isocyanate, soybean gum and cottonseed meal gum.
4. The water-resistant aldehyde-free high-density fiberboard of claim 1, wherein the auxiliary agent is one or more of polyvinyl alcohol, polyether polyol, isopropanol, formamide and carbamide.
5. The water-resistant aldehyde-free high-density fiberboard of claim 1, wherein the water-repellent agent is paraffin, organosiloxane, or aluminate.
6. The water-resistant aldehyde-free high-density fiberboard of claim 1, wherein the reducing agent is one or more of sodium borohydride, potassium borohydride and oxalic acid.
7. The water-resistant aldehyde-free high-density fiberboard of claim 1, wherein the inorganic gelling material is aluminum dihydrogen phosphate, sodium silicate, magnesium sulfate, magnesium chloride or calcium oxide.
8. The water-resistant aldehyde-free high density fiberboard of claim 1, wherein the medium comprises: one or more of vanillone, acetosyringone, syringaldehyde, p-coumaric acid, ferulic acid, methyl syringate, sinapic acid, vanillin, ABTS and HBT; the enzyme is one or more of laccase, peroxidase, oxidase and xylanase.
9. The water-resistant aldehyde-free high-density fiberboard of claim 1, wherein the pH regulator is one or more of citric acid, sulfuric acid, hydrochloric acid, formic acid, acetic acid and sodium acetate.
10. A process for preparing the water-resistant aldehyde-free high-density fiberboard of any one of claims 1 to 9, comprising the steps of:
(1) uniformly mixing the raw materials, paving and forming to obtain a plate blank;
(2) hot-pressing the plate blank obtained in the step (1), wherein the hot-pressing technological parameters are as follows: and (3) hot-pressing at the temperature of 160-240 ℃, for 3-5 min, and under the pressure of 1-7 MPa, so as to obtain the fiberboard.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113563729A (en) * | 2021-08-05 | 2021-10-29 | 优优新材料股份有限公司 | Waterproof flame-retardant formaldehyde-free veneer with solid wood grain paint veneer and application thereof |
| CN113752356A (en) * | 2021-09-23 | 2021-12-07 | 广西上思华林林产工业有限公司 | Preparation method of high-density fiberboard |
| CN116178979A (en) * | 2023-03-03 | 2023-05-30 | 王建强 | Anti-cracking low-formaldehyde multi-layer board and preparation method thereof |
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| CN113563729B (en) * | 2021-08-05 | 2023-02-24 | 优优新材料股份有限公司 | Waterproof flame-retardant formaldehyde-free veneer with solid wood grain paint veneer and application thereof |
| CN113752356A (en) * | 2021-09-23 | 2021-12-07 | 广西上思华林林产工业有限公司 | Preparation method of high-density fiberboard |
| CN116178979A (en) * | 2023-03-03 | 2023-05-30 | 王建强 | Anti-cracking low-formaldehyde multi-layer board and preparation method thereof |
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Application publication date: 20201030 |